I experimented with it and was able to get everything I wanted, but it required many extra steps and prompts. For instance, my app automatically detects the tone of the message while I am typing, whereas in GPT, I need to manually request the tone after making any changes to the text.
As a native Spanish speaker, I often used ChatGPT to improve my emails in English. It was very time-consuming having to type the same prompt multiple times in a day to set my writing style and format. That's why I decided to build an app to simplify my process. You can set the style and format just once, and with a single click, you can improve your text. You have the option to include the email thread or any relevant context for a more personalized improvement. Additionally, I've included features designed specifically for non-native speakers, like tone detection and the ability to request a few different alternatives for any word/phrase. And of course, you can talk directly with the AI to create a draft or modify the text. Check it out: https://talktext-ai.web.app/